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[–] 1 point 10 hours ago (3 children)

Yeah, it makes a lot of sense to do a test dive right at the start.

A 12 inch gun on a sub is crazy. That's not just a gun from a battleship, that's one of the main guns from the battleship. That's a ridiculous amount of overkill for a merchant ship. If you wanted to ambush armoured enemy ships that's another matter. If you could successfully do that, it might not even matter if the gun only lasted a few shots. A sub is cheap compared to anything requiring a 12 inch gun. I'm surprised they got far enough with the program to actually test fire them.

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  • [–] 1 point 10 hours ago (2 children)

    Since the gun could only be loaded while the sub was surfaced, it had to sink its target in one shot, which was unlikely to be the case against warships, even something small and unarmored like a destroyer.

    https://en.wikipedia.org/wiki/HMS_M1_(1917)

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  • [–] 1 point 9 hours ago (1 child)

    Good luck managing to hit a destroyer with a fixed gun.

    I would imagine that if you did manage a hit though, it would be devastating. I don't think there were many ships that could shrug off hits from a 12 inch gun. Even if it didn't sink, it would probably be badly damaged, which might give the sub the opportunity to surface somewhere safe, reload, and shoot again.

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  • The destroyers at the Battle off Samar took multiple hits from Yamato's 18.1" guns. The initial hits were armor-piercing rounds that passed right through without doing much of anything, but they took multiple hits before sinking even after the Japanese switched to high-explosive shells. I think a single hit on a destroyer from a 12" shell would certainly not sink it, and depending on where it hit it would probably not even be seriously disabled. Given the close range (less than 1000 yards), the destroyer's deck guns would still knock out the sub pretty quickly.

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